(Optional) Select Reference level or Surface

This section is enabled by the radio button to the left of the Reference surface legend. The options to choose among are:
  1. Zref = 0.0, or
  2. a constant level of reference or
  3. any Surface Reference stored in another layer.

In this case we will choose as a reference an irregular surface described by data stored in Project layer.

Fig. 65

Notice that there is no place to define the destination layer. The reason is that the resulting figure will not be part of the main drawing.
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